"Refractory clay deposits of south-central Colorado : a description of the refractory and semirefractory clays in the Purgatoire formation and Dakota sandstone"
"Refractory clay deposits of south-central Colorado"@en
"Refractory Clay deposits of South-Central Colorado : a description of the refractory and semirefractory clays in the Purgatoire formation and Dakota sandstone, &c"@en
"Refractory clay deposits of south-central Colorado : a description of the refractory and semirefractory clays in the Pergatoire formation and Dakota sandstone"
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